CVE-2019-1980

What it is

A vulnerability in the protocol detection component of Cisco Firepower Threat Defense Software, Cisco FirePOWER Services Software for ASA, and Cisco Firepower Management Center Software could allow an unauthenticated, remote attacker to bypass filtering protections. The vulnerability is due to improper detection of the initial use of a protocol on a nonstandard port. An attacker could exploit this vulnerability by sending traffic on a nonstandard port for the protocol in use through an affected device. An exploit could allow the attacker to bypass filtering and deliver malicious requests to protected systems that would otherwise be blocked. Once the initial protocol flow on the nonstandard port is detected, future flows on the nonstandard port will be successfully detected and handled as configured by the applied policy.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

1.0% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2019-11-05 20:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-08-11 19:37 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.0% in the next 30 days (EPSS).
• Severity: 5.3 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2019-11-05 20:15 UTC

Last modified

2026-08-11 19:37 UTC

Exploit probability

1.0% · EPSS, next 30 days

Weakness

CWE-264

Record status

Modified

Affected

• Cisco Firepower Services Software For Asa
• Cisco Secure Firewall Management Center ≤ 2.9.12.15
• Cisco Secure Firewall Management Center ≤ 2.9.13.6
• Cisco Secure Firewall Management Center ≤ 2.9.14.5
• Cisco Secure Firewall Management Center 2.9.15
• Cisco Secure Firewall Management Center 2.9.16
• Cisco Secure Firewall Threat Defense

Attack profile CVSS 3.1 · 5.3

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2019-1980.md and follow it. Check whether this project is affected by CVE-2019-1980. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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